[12.2.3] form re-render is slow(around 20 seconds) with JRE 1.8.0_51.

Hi, experts

I got a issue that form re-render is slow(around 20 seconds) with JRE 1.8.0_51.

[Issue]

1. EBS 12.2.3, login and click [System Administrator]--->[Profile]--->[System]

2. resize the displayed form . (JRE 1.8.0_51) 3. the rendering is slow(around 20 seconds)

[Confirmed information]

1. issue occurs with JRE 1.7 also.

2. could confirm this issue by Firefox

3. issue occurs with IE 11.

4. issue occurs with specific environment.

5. confirmed below bug, but seems not hit.

       　　Bug 21843509  - Performance delay in 8u60

　　      Bug 21901842 - JRE8u65: Applet is delaying around 20 secs before launching on IE

　　      Bug 21701176 - JRE 8u60 has processing delays over 8u51

[Question]

1. Any approach method could isolate this issue?